/**
 * 
 */
package com.sc.softmgr.common.utils.crypto;

import java.security.MessageDigest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @Content MD5加密,不可逆
 * 
 * @Date 2017年6月7日
 * 
 * @author OprCalf
 */
public class MD5Util {

	private static final Log log = LogFactory.getLog(MD5Util.class);

	/***
	 * MD5加码 生成32位md5码
	 */
	public static String string2MD5(String inStr) {
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			log.error("MD5Util加密异常", e);
			return "MD5Util加密异常";
		}
		char[] charArray = inStr.toCharArray();
		byte[] byteArray = new byte[charArray.length];

		for (int i = 0; i < charArray.length; i++)
			byteArray[i] = (byte) charArray[i];
		byte[] md5Bytes = md5.digest(byteArray);
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16)
				hexValue.append("0");
			hexValue.append(Integer.toHexString(val));
		}
		return hexValue.toString();

	}

	public static String MD52String(String str) {
		return convertMD5(convertMD5(str));
	}

	/**
	 * 加密解密算法 执行一次加密，两次解密
	 */
	private static String convertMD5(String inStr) {

		char[] a = inStr.toCharArray();
		for (int i = 0; i < a.length; i++) {
			a[i] = (char) (a[i] ^ 't');
		}
		String s = new String(a);
		return s;

	}

	// 测试主函数
	public static void main(String args[]) {
		String s = new String("tangfuqiang");
		System.out.println("原始：" + s);
		System.out.println("MD5后：" + string2MD5(s));
		System.out.println("解密的：" + MD52String(s));

	}
}
